public class J03Type {
    public static void main(String[] args) {
//      int
        System.out.println(100);
        // double
        System.out.println(1.0);

        System.out.println("==变量==");
        /*
        确定数据类型   变量名
        =  等号，赋值运算符
         */
        int num = 1000;
        // 修改变量的值,只需要重新赋值
        num = 2000;

        System.out.println(num);
        System.out.println(num);
        System.out.println(num);
        System.out.println(num);
        System.out.println(num);
        System.out.println(num);
        System.out.println(num);
    }
}
